It is throwing an error for me too, but the certificate doesn't seem expired: >Issued by: Let's Encrypt Authority X3 >Expires: Thursday, 23January, 2020, 0:16

It is throwing an error for me too, but the certificate doesn't seem expired: >Issued by: Let's Encrypt Authority X3 >Expires: Thursday, 23January, 2020, 0:16:50 Central Standard Time